Abstract: A set of versions of a file, with one chosen as baseline version, is displayed as a single flow of material where all agree with the baseline and in separate difference columns where they do not. A current version may be edited either directly or by adoption of material from different versions, which may be toggled in and out of visibility. Sequential undo (step-wise or by a slider) can be localized to chosen subsets of the current version, and any chosen subset can be restored as a unit to an earlier state.

Abstract: We construct a systematic scheme of information concerning provenance among digital objects, make this information available to the user, and use it to modify the effect of user's actions. Such relationships are derived by comparison of elements in the files or by making records when creating them. This information may be displayed by a view of a descent tree, a flow diagram, or internal markup of a combined view of object content. The provenance structure enables selection of related subsets for search, constraints on search such as ‘root occurrence’ or ‘unmerged occurrences’, and selection of appropriate objects to merge or respond to. It defines the active set of objects for any chosen time, enabling a display of commonality and difference among versions at any stage of a project involving one or more collaborators, with or without one of them having final authority over the suggestions of the others.

Abstract: A set of versions of a file, with one chosen as baseline version, is displayed as a single flow of material where all agree with the baseline and in separate difference columns where they do not. A current version may be edited either directly or by adoption of material from different versions, which may be toggled in and out of visibility. Sequential undo (step-wise or by a slider) can be localized to chosen subsets of the current version, and any chosen subset can be restored as a unit to an earlier state.